Method of making screw-nuts.



' A. G. ANDERSON.

M. 3 t t A 3, by

.Patented Oct. 6, 1908.

I following is a specification.

s Ar" st res.

Aeneas c. Annsnson'or woacnsrn'a,MAssAcHussr'rs, ASSIGNOR, BY Missile ASSIGN- MENTS, TO woncnsrsn ranssan STEEL COMPANY, or WORCESTER, MASSACHUSETTS,

A CORPORATION OF MASSACHUSETTS.

' am'rnozo or MAKING so'aEw-nn'rs.

Specificatiomoi Letters Patent.

Patented Oct; 6, 1.908. I

Application filed January 14, 1903. Boris! No. 188,950.

Toall whom it may concern:

Be-it known that I, ANDERS G. ANDERSON, a citizen of the United States residing at Worcester, in the county of Worcester and Commonwealth of Massachusetts, have in vented a new and useful Improvement in Methodsfof Making Screw-Nuts, of which the This invention relates to that class of nuts known as cap-nut,'which have an inwardly turned lip-at the crown adapted to project over the -screw thread and cover thejoint between the nut and thescrew threaded piece to which the nut is attached and it has for its objects to improve the quality, simplify the manufacture and reduce the cost of makingonnts of this class'from sheet metal by the process of upsetting the sheet metal to secure the requisite thickness to cute screw thread base of the nut.

In the accompanying drawings forming a part of this specification, Fi ure 1 represents a sheet metal blank from which my improved nut is made. Fig. '2 represents a pair of dies and enable a wrench to be applied to the by which the first o eration of stamping or shaping is erfo'rme Fig. 3 represents the dies and il ustrates the method of upsetting Fig; 2.

the blank. Fig. 4 shows the diesfor trim,- so

ming the base of the'nut in hexagonal shape. Fig. 5 re resents partly in sectional View a nut blan Fig. 6 represents the dies for turning the interior flange, and Fig. 7 represents partly sectional view the completed nut.

I first cut a flat annular blank from sheet metal, such as is shown at 1, Fig. 1, hav-inga central hole 2, less in diameter than the 11iterior diameter of the completed nut. The annular blank 1, is then stamped between a pair or dies 3 and 4 into a tapering or funnelshap'ed piece shown in sectional view at 5, The diameter of thedie 3 is the same as the interior diameter of the completed nut, and it has its lower end rounded at 6, and provided with a concentric spur or ready to receive a screw thread.-

nut, as shown at s, Fig. 2. -The blank,

shaped as at 5, Fig. 2, is then placed or n the spindle 9, held concentricall with a on cularrecess 10, in the die 11, wit the smaller or i crown end of the die uppermost and com pressedbeneath a hollow descending die 12,

provided with a lip 13, which slides over the outer surface of the crown portion of the blank and stripping the metal downward,

upsets the base 14 ofthe nut blank and shapes the interior to fit 'the cylindrical spindle 9. The recess 10 of the die 11 is provided with a movable bottom capable of bein lifted as the die 12 is raised to remove the lank from the s indle 9. The base 14 is then by suitable dies as represented in Fig. 4, and

adapted to receive a wrench as shown at 15, Fig. 5. The thickness of the'metal at the crown end of the blank is then further reduced by turning'a ortion of the interior as shown at 16, Fig. 5, orming a shoulder 17 as deep as the screw thread 18 Fig. 7, which is then cut on the interior 0 lindrical surface 19: The screw threaded lank is then applied to a spindle, 20 with its base resting o'n a-movable support 21, which is capable of being raised to strip the blank oif the, spindle.

, The blank old on the spindie'2O is centered thread 18, the amount of. the projection beyond the screw thread being determined by the difierence diameter between the cylindrical spindle 20 and itsreduced section 22.

I do not herein claim broadly the formation of a screwnut from sheet metal by the upsetting of the metal to form a base as this has been heretofore proposed. By no. im-

proved method 1 form a small contra hole only in the circular blank and enlarge it to the interior diameter of the nut by expansion overthe rounded end of a die 3, not only b its screw t read 1-8, and the upper portion saving in stock, but at thesame time reduc- ,1 ing the thickness of the metal at 8, to form the crown of the nut. I I also upset-the base @entering s indie after the screw thread has been out, ti ereby enabling the thread to cut by a tztp passing entirely throngl'x. the nut and. allowing coinparntivoly Wide [hinge to. he formed on the crown of the nut. Each of the operations illustrated in Fi s. 2 and 3 can be accomplished by a. sing 9 move ment of the (lies, Whereas the she ing of the I nut from a solid fiat blank wool require a.

progressive shaping of the motel by a series of two or more operations in piece of each one required by my method.

,What i claim as my invention and desire to secure by Letters Patent ie:-

1. The within described method of making a screw nut from a funnel sheerl blank, consisting in n setting the larger 9nd. of the funhe]. shaped innit by the pressure ot a reciprooat ting hollow (lie which compresses the funnel shaped blank. around a. stznioinn'y cylinh'ieel spindle, forming it screw thread in the hienk, Centering the'hlonh by its screw thread on e. spindle having a. reduced section and turning over theen Ll of the blank to form on interior iieitige, substantially as described.

2. The wi 31 described method of making a screw nut irom metal blank, coneooee I also turn the to form. the crown of the nut, centering the funnel shu-ped blank on cylindrical spindle with the larger end of the blank supported and epplying pressure to the outside of the hlenk by a. reciprocating hollow die by whichv the metal is forced from the crown section into the base section of the blank and the hhmk is compressed around the cylindrical spindle, reducing the thii' ees of the crown section and forming an: interior shoulder in the blank, cutting it screw thread in the base section of the blank and afterward thrning flange, snhstentielly as described.

3. The method of making a scre i' nut having 21.11 interior flange at its crown, consisting in first out-ting a screw" thread in it nut blank,

supporting semi blank l1; its base and center 1110 the 581110 by its screw thread in proper relation to a reciprocating die having a recess ndapted to shape the flange and. turning; over a. flange on the crown of the blank hy the pressure of said lie, whereby said flange is over the crown section 't-O fOlllfl an. interior made concentric with said screw thread, sub-- stentinily as described.

Dated this 9th tiny of January 19%.

ANDERS G. i'SrNDEllSON. VitilfiSSQS'.

PENELOPE Connnnnnon, iion'ns B. FOWLER. 

